Method of fitting and winding coils on pole armatures or field magnets



29,1931. PAPST 1,838,150

Filed sept. 29,' 195o III IH HNI Patented Dec. 29., 1931 UNITED STATESPATENT i OFFICE HERMANN PAPST, F ST. GEORGEN, rSCHWIRZWALD, GERMANYMETHOD OF FITTING' .AND WINDIN G- COILS ON'.POLE-A131111:.ATUIRES` 0RFIELD* MAGNETS Application led September 29, 1930, Serial No. 485,163,and in Germany October 5, 1929.

The invention relates to a method for litting and winding coils onpole-armatures or field magnets for electrical machines, wherein thepole pieces are formed integral with the i core and, in order to obtaina field with a larger cross-section, are made to extend back toapproximately the centre of same and over the coils, i. e. the polepieces are cut away on the inside to accommodate the coils.

le Armatures or field magnets of this kind are used especially for smallmotors where it is essential for the cost of manufacture to be kept downto a minimum. Hitherto it has only been possible to fit these coils onarmatures with cut-away pole pieces, by having one head of the core maderemovable. This involves an appreciable increase in cost and a morecomplicated design, which is particularly troublesome where the ironcore coni sists of sheet ironlayers, such as dynamo sheets.

According to this invention this drawback is obviated and the stampingofthe sheets of which the armature is to be formed out of a single piecefor the entire section of the form desired is rendered possible byhaving the ends of the pole-pieces separated by a space somewhat largerthan the width of the bobbins of the coils, and by having the bobbinsdivided ory formed in two parts. In assembling, the two halves of onebobbin are held together about the middle of the iron core and woundwith the coil wire. When the first coil is finished, the bobbin, the twoparts of which are now held together by the winding, is pushed laterallyinto its final position against the inner face of the pole piece, andthe two halves of the second bobbin are then placed in position on thecore and wound in a similar M manner. 'Vhen the second coil is finished,

this also is pushed over laterally into its finaly position against theinner face of the other pole piece. The coils are retained in theirworking positions by means of a suitable intermediate member.

In the accompanying drawings which illustrate diagrammatically oneembodiment of this invention Figure 1 illustrates a fullyvwound fieldmagnet core or armature for an electric machine. A

Figure 2 illustrates the winding of the first bobbin. J A Figure 3 thewinding ofthe second bobbin, and 1 Y l 1 f Figure 4 one half of a bobbinin perspective. l

The armature or field magnet consists of the pole pieces 1 and 2 formedintegrally with ancore 3 and the tips of the pole pieces extendbackwards towards the centre so that the diS- tance aibetween the ends bof the pole pieces is somewhat greater than the width c of the bobbins land 5, so that the latter, made up of two parts, can be placed on thecore 3.

When winding, the two parts of the bobbin 4 are placed on the core 3 inthe position shown in Figure Qand the wire wound thereon. When this coilis finished it is pushed to the left againstfthe inner face of the polepiece 1 and the two parts of the bobbin 5. are then placed in themid-position as shown in Figuref). This coil, having been fully wound,isfpushed'laterally to the right against the inside face of the polepiece 2 and a distance piece 6 is placed between the two bobbins andsecured in position by a screw 8 or other convenient means.

1. The method of fitting and winding coils on pole armatures in whichthe pole pieces are integral with the core, the tips of said pole piecesbeing extended backwards towards the centre thereof the wound bobbinsbeing accommodated adjacent the inner faces of the pole pieces, meansbeing provided for retaining the respective bobbins in the latterposition, which consists in placing the bobbins, formed in two parts, inmid-position on the core for winding after which operation the Woundbobbins are moved laterally to each end of the core against the innerfaces of the pole pieces, and finally securing the retaining means inposition.

2. The method of fitting and winding coils on pole armatures in whichthe pole pieces are integral with the core, the tips of said pole piecesbeing extended backwards towards the centre thereof the wound bobbinsbeing acim commodated adjacent the inner faces of the pole pieces7 meansbeing provided for retaining the respective bobbins in the latterposition, Which consists in placing a two-part r bobbin for one coil onthe core and Winding same While in mid-position thereonthe Wound bobbinbeing subsequently moved laterally on the core to a position adjacentone pole piece after which operation a two-part bobbin for a 10 secondcoil is similarly placed in the midepo* sition, Wound and movedlaterally into p0sition adjacent the opposite pole piece and finallysecuring the retaining means in p0sition.

15 3. The method o fitting and Winding coils on pole armatures in Whichthe pole pieces are integral with the core7 the tips of said pole piecesbeing extended backwards towards the centre so as to be separated by a2a space somewhat greater than the Width of the bobbins, the Woundbobbins being accommodated adjacent the inner faces of the pole pieces,means being provided for retaining the respective bobbins in the latterposition,

25 which consists in placing two-part bobbins singly in mid-position onthe core, Winding the coils thereon, moving the wound bobbins laterallyto a position adjacent the respective pole pieces and .finally securingthe retaining 3o means in position.

4. An armature for an electric machine comprising oppositcly disposedpole pieces and a straight core formed integral therewith the tips ofthe pole pieces being extended 35, backwards towards the centre of thecore, a two-part coil Wound bobbin arranged on said core adjacent eachpole piece and detachable means secured to the core for retaining saidbobbins in their respective positions.

40 HERMANN PAPST.

